Table 2 Factors associated with interhospital transfer from acute care trauma hospitals to neurotrauma centers for patients with moderate-to-severe traumatic brain injury

GCS score

 14–15

1.00

 N/A

 9–13

2.78 (2.03–3.81)

N/A

< 0.001

 3–8

1.70 (1.23–2.34)

N/A

0.001

Preinjury ASA-PS

 1–2

1.00

 N/A

 3–4

9.11 (1.66–49.94)

N/A

0.011

ASA 1–2*age

0.94 (0.90-0.997)

N/A

0.038

ASA 3–4*age

0.92 (0.87–0.97)

N/A

0.003

Year of incident

0.88 (0.82–0.94)

N/A

< 0.001

s(age)

N/A

2.92

< 0.001

s(NISS)

N/A

3.65

< 0.001

ti(age, NISS)

N/A

1.73

< 0.001

ti(NISS, distance)

N/A

0.88

0.008